Water-insoluble azo dye



itentcd June 10, 1941 UNITED STATES PATENT OFFICE warnn-msownm AZO DYE Werner Zerweck and Wilhelm Knnze,

on-the-Main-Fechenheim, Germany,

Frankfortassignors to General Aniline & Film Corporation, a corporation of Delaware Original application May 12, 1937, Serial No. 142,170. Divided No Drawing.

and this application June 29, 1939, Serial No. 281,884. In Germany May 15, 1936 1 Claim.

This application is a division of our copending ipplication Serial No. 142,170, filed May 12, 1937.

The present invention relates to a water insoluole azodyestufi' of the formula which is obtained by combining diazotized 3- chloro-4-aminoacetophenone with diethylaniline.

The dyestufl thus obtained is especially useful for the dyeing and printing of cellulose esters and ethers, such as for example acetate silk. Advantageously, the dyeing process is performed with the addition of a dispersing agent. The

dyeings obtained thereby are distinguished by good iastness properties which are superior to those of similar known dyestuffs.

The invention is illustrated by the following example, the parts being by weight.

Example 1'12 parts of 3-chloro-4-aminoacetophenone are diazotized in the usual manner, and the dlaao HaC-C 0 -N=N N which dyestufl is a red powder, dyeing acetate silk from a soap-containing bath in the presence of a dispersing agent strong and clear reddishorange shades of valuable tastness properties.

WERNER ZERWECK. 

